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Starting Up the System

8-3

SIMATIC 545/555/575 System Manual

2. Initialize the CPU by completing the following procedures:

• If you have not already done so, disable the CPU battery. (For

545/555 CPUs, turn off switch 9 on the CPU front dipswitch. For

575 CPUs, disconnect the battery.)

• Turn on power to the base.

• With the battery disabled and an unprogrammed (E)EPROM, the

CPU clears memory and enters PROGRAM mode.

• Enable the battery backup circuit by turning on switch 9. The

battery LED should light. The CPU is now initialized.

NOTE: If the battery LED does not come on, the battery is low. The LED

should be lit when the system is powered and a good battery is installed and

enabled.

3. Connect your programming device to one of the CPU communication

ports. Place the CPU in PROGRAM mode.

4. Using your programming device, enter the memory and I/O

configuration. Refer to Table 8-1, Table 8-2, Table 8-3, Table 8-4, or

Table 8-7, as appropriate.

5. Enter the user program. See the SIMATIC 545/555/575 Programming

Reference User Manual for programming information.

6. Use your programming device to JOG motors, solenoids, or other

positioning devices one at a time to establish correct rotation or

positioning.

After all the steps are performed and verified, place the CPU in RUN mode.

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